Help Needed: Spellcheck on Mac

I am asking for help getting spell check for a 2007 desktop Mac on 'Leopard'. I have googled it and found a way to use it on TextEdit and checked
'Check spelling as you type' but as soon as I come back here it's not on and there is no option for spell check in Edit, just cut and paste sort of
options.

I used to have spellcheck permanently until I started clearing up the mac and I don't know exactly what I did to make it go away.

Thank you, I think I'm going to have to swith back to Safari. Not having any luck with Firefox, I went to help as you said and saw that it is
switched on for Firefox but still when I mispell words I get no squggly red line.

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